Frederick scherb



(No Modei.)

F. SOHERR.

STEAM Boum.

PatentedApr;6,g18a6 fw! N PETERS. Pima-Lnhugmphur. wasn act descriptionthereof.

by liberal passages with the two ends of the 5o backward through thedrum A, disengaging sider the best means of carrying out the in- 'ingthe general arrangement ol" the boiler.

UNITED STATES- PATENT Ottica.

FREDERICK SCHERR, OF BROOKLYN, NE\V YORK.

STEAM-BOILER.

PEGIFICATION forming part of Letters Patent No. 339,478, dated April 6,1886.

Application filed October 1,1885.

To all whom. it may concern.-

Be it known that I, FREDERICK Sonnen., of Brooklyn, Kings county, in theState of New York, have invented a certain new and useful Improvement inSteam-Boilers; and I do hereby declare that the following is a full andex- The improvement relates to` the class in which the water and steamare circulated through pipes and tlieheat is received from the hotproducts of combustion circulating between.

Theimprovement relates to the construction of the portions generallytermed headersj being boxes of castiron or other suitable ma terial, inwhich the ends of the tubes are fitted.

The following is a description of what I convention.

` The accompanying drawings form a part of this speciiication.

Figure l is an outline side elevation show- The remaining figures are ona larger scale and show the novel parts with so much of the ordinaryparts as is necessary to indicate their relation thereto. Fig. 2 is afront or face view of two of the headers. Fig. 3 is a plan view of aportion. Fig. et is a vertical section on the line in Fig. 2. Fig. 5 isa vertical section showing a modification.

Similar letters of reference. indicate corresponding parts in all theiigures where they occur.

A is the drum or separatingvessel, in which the steam is disengaged fromthe water.

B B are the headers, connected, respectively,

drum A. Certain port-ions of the headers will be designated, whennecessary, by additional marks, as B B2. The inclined tubes C extendthrough the furnace and constitute the principal heating-surface. Iconnect the tubes with the headers by the process known as expanding.

The water moves forward and upward through the tubes C, being partiallyconverted into steam in the passage. The water moves upward through thefront series of headers B,

from its surface the steam which has been gen- Scrial No.18,735. (Nomodel.)

erated, and descends through the back series tube is substituted andtightly set in the headers, the headers with their attached tubes areagain replaced and the bolts reset. They are provided with hand-holes b,which are of oblong form and secured by oblong covers D, applied on theinside and held in place by bolts E, bridges F, and nuts E.

B are the upper and lower faces of theheaders. They are finished withconical faces. adapted to match tightly together and to hold themselvesreliably in the correct position.

A liberal space is provided for the movement of the water upward anddownward through apertures m in the faces B3. These apertures arecrossed by spiders M, adapted to be strongly and tightly securedtogether by bolts P and nuts P'. These may be operated through thehand-holes b when the covers D are removed.

Figs. 2, 3, and a show the spiders M as a Y part of the same castingwith the headers and lying in the general plane of the correspond ingface B3.

The modification shown in Fig. 5 has the spiders standing farther inwardtoward the center of the header. This construction will allow theopening m to be unobstructed. In this form the spiders may be eithercast in one with the headers or made and applied as separate pieces, asconvenience may require.

The hand-holes b need not be of the full size Aof the tubes C. fore inboilers of this class to make the handholes sufficiently large to allowthe tubes C to be drawn out and new ones inserted, when required,through these hand-holes; but my construction avoids the necessity fortaking tubes out or putting new ones in through the hand-holes.

The hand-holes in my construction only It has been common hereto- IOOvboth ends immersed require to be of such size as to allow an eX-panding-tool to be inserted to expand the tubes C and effect thenecessary strong and tight junction between O and B. The ordinary stylesof eXpanders may be contracted to a size considerably smaller than thetube which they are to set. The hand-holes are only necessary for thesetting of the tubes C, and for the introduction at intervals of acleaning device, as a brush.

The inner face of the side B2 adjacent to the hand-hole should befinished so as to make a tight joint with the cover, which, it will beunderstood, is correspondingly inished near its edge, so that the partsmake a tight joint, metal and metal. The oval form ot' the hand-hole andthe corresponding oval form of the cover D allows the cover to beinserted by turning it in a certain position, and by .shifting itsposition, after it is introduced, to be applied on the inner face, so asto tightly close the hole. This has long been a successful inode ofclosing handholes and man-holes in boiler-shells. I have discovered thatby giving sufficiently increased dimensions to the headerslongitudinally the same construction may be used in headers. There is noobjection to the increased length of header-by which I mean thedimensions in the direction of the tubes C prolonged.

I make the headers with the ends rounded. There is a plate extendingfarther to fill out the corners of the rectangle, so that there shall beno considerable aperture between the headers.

Vhen itis necessary to take out a pair of v headers and the tubesconnecting them, I remove the haudhole covers of that header, and alsoof the headers above and below, and take out the bolts I). Then, byslightly springing apart the tubes above and below, which may beeffected by a jack-screw or other simple device, I can get the spacerequired to allow for the conicity of the surfaces, and can draw out thetubes with their attached headers.

When the holding-bolts which hold the headers together are arranged toextend through from the steam and water space into the externalatmosphere, there is a tendencyv to leakage along the sides of thebolts. A strong pressure is on the Huid enveloping the head, while airat only ordinary pressure envelops the other end of the bolt. Myarrangement avoids the liability to leakage along the bolts, because thebolts sit within the duid under pressure. l Y

Modifications may be made in the forms and proportions without departingfrom the principle or sacrificing the advantages of the invention. Thefaces B3 may be coned considerably more or less than shown. I preferthat they shall be coned about as shown. The faces B3 may serve iffinished plane. It is only essentialthat they correspond with each otherand be finished smoothly, so that they can, by a simplepressure inducedby the bolts, be brought into absolutely tight contact.

Although, as above described, it is not necessary to make the hand-holesso large as the tubes, it may be preferable in general practice to givethe hand-holes such size. Such will allow the tubes to be taken out andreplaced through the handholes, if preferred in any case.

I attach importance `to the fact thatn the action of the bolt P iscentral on the bearingsurfaces, which must be maintained in steamv tightcontact,V around the aperture through which the circulation is effected.By my arrangement the single bolt -P`connectsand disconnects the work,and when in place and properly set up exerts its pressure uniformly onthe matched faces.

I claim as myinvention- 1. In a sectional steam-boiler, the headers B B,having matched faces and spiders or skeleton cross-frames M andseparately removable bolts P, arranged centrally with both ends in thespaces under pressure, as and for the purposes herein specified.

2. In a sectional boiler, the headers B, of elliptical form, casing twotubes each, and having connections,arrange'd as shown, where-- by, whenplaced together, the tubes will be joggled and the communication betweenad` jacent headers will be in vertical lines, as set forth.

3. The headers B, matched and secured together in joggled verticalseries, with co1nmunicating passages m, arranged in Vertical lines, andhaving hand-holes with suitable securing means, combined with each otherand with securing-bolts P, arranged to allowthe head-r ers and tubes tobe separately removed and replaced, as set forth. l

In testimony whereof I have hereunto set my hand, at Brooklyn, this 16thday of September, 1885, in the presence of two subscribing witnesses.

FRED. 'SCHERR W'itnesses:

GEORGE SIBLEY, G. L. STRAUB.

IOO

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